Here's some inspiration taking 2 budget Ikea cabinets:
Billy - Bookcases
Source: http://www.ikeahackers.net/2012/01/billy-bookcases-to-built-ins.html
Pax - Build in Cupboards
Source: http://www.ikeahackers.net/2012/02/custom-built-in-ikea-pax.html
Better Homes and Garden has posted a link showing the step by step process -
http://au.lifestyle.yahoo.com/better-homes-gardens/video/watch/29336055/1416628/
